Hi!
I can offer you mastering quality controller project.
It has:
5 inputs, each can go to CUE or REC selector
3 speaker outputs
64 steps of 1dB level controll
Mono SUM, DIFF, L, R
DIM
Talkback
DIM, TB, each CUE IN, SPK OUT has user-adjustable TRIM value
(you just press trim+in1, set -3 dB, press trim again).
TB latches after you hold it >5 sec.
Fully balanced, passive, only metal film resistors and relays.
Any clicks on audio at all, if there's no DC offsets at source outs
(there's a little trick to do this).
About total cost of the project.
Case
50 relays
20 MEC switches (with led)
PCB's
Power supply
IC's, misc stuff
Connectors
It comes up to about EUR 350-450 total.
There's 2 audio pcb's (each for l or r channels),
relays receiver board, keyboard board, controller's PIC board.
Project is not simple at all.
Any interest after this?